ID Collision Checker
Related tools
Validators and utilities that complement ID Collision Checker — same session, no sign-up.
Ctrl+Enter (or ⌘+Enter) to check.
Paste a list of IDs (one per line). Find duplicates and line numbers.
About this tool
One ID per line. Empty lines are ignored. Reports total, unique count, and each duplicate ID with line numbers.
Useful for UUID lists, log IDs, or any list where uniqueness matters.
How to use this tool
- Paste your sample in the input (or fetch from URL if this tool supports it).
- Run the main action on the page to execute ID Collision Checker.
- Read the result, fix the source data or config, and re-run if needed.
What this check helps you catch
- Paste a list of IDs (one per line). Find duplicates and line numbers.
- Limits called out in the description (what this tool does not verify — e.g. live network reachability, issuer databases, or strict schema contracts unless stated).
- Structural or syntax mistakes that would break parsers, serializers, or the next step in your workflow.
FAQ
- What does ID Collision Checker do?
- Paste a list of IDs (one per line). Find duplicates and line numbers. Use the form above, then see “How to use” and “What this check helps you catch” for behavior detail.
- Is this a substitute for server-side validation?
- No. Use it for manual checks and triage; production systems should still validate and authorize on the server.
- Where does processing happen?
- Most validators here run in your browser. If a tool calls an API, that is stated on the page. See the site privacy policy for data handling.